Covforge is exactly correct.
If you use a table for a ground make absolutely 100% certain that is a bullet proof ground from the table to the welding ground.
Or you might be a dissapointed owner of a power tool that used to work.
If the tool is grounded it may be an easier ground path than the table. Thus the 10 amp tool or whatever it is may see a full 150 amps of welding current releasing the factory installed smoke.
Please note: once the factory installed smoke is released it is almost impossible to re-install the smoke and make the tool run again.
The same principal applies if you are welding on a truck bed or other equipment that should be grounded and you lay a power tool down, creating an alternate ground path for the welding current thru the tool.
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